Run: 2026-04-24-01KQ0G2WYVHB5QCVP3AEBD3PX2

Run Details

Model:
Claude Opus 4.7 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
7.3s
Cost:
$0.026850
Provider:
Amazon Bedrock

Evaluation summary

Score Evaluator
Details Link
100.00% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain hammered against the windows of Blackwood Manor tonight. Detective Harlow stepped inside and removed his soaking wool coat. A single candle flickered near the body on the floor. Lord Ashby lay motionless, his eyes frozen in silent terror. Blood pooled beneath him, staining the ancient Persian rug crimson. Five guests stood frozen, each wearing an expression of horror. Harlow studied them carefully, noting every twitch and nervous glance. One of these people had murdered their host this evening. The storm outside would trap them all until dawn arrived. Harlow smiled grimly, knowing the killer would soon be revealed.
created_at"2026-04-24T19:39:51.137Z" 4/24/2026, 7:39:51 PM
model"anthropic/claude-4.7-opus-20260416"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2208
moderation_latency(null)
generation_time7244
tokens_prompt46
tokens_completion283
native_tokens_prompt65
native_tokens_completion1061
native_tokens_completion_images(null)
native_tokens_reasoning125
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
usage0.02685
router(null)
provider_responses
0
endpoint_id"0fa65117-00d9-4835-808d-9b68041d9ce4"
id"50a738da-7945-43b9-9a23-51ba3c4b172f"
is_byokfalse
latency663
model_permaslug"anthropic/claude-4.7-opus-20260416"
provider_name"Amazon Bedrock"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777059591-r6RRgGnKNMFtwZhNWQvv"
session_id(null)
api_type"completions"
id"gen-1777059591-uvhdtyI2xdrwTwrm8cPJ"
upstream_id"50a738da-7945-43b9-9a23-51ba3c4b172f"
total_cost0.02685
cache_discount(null)
upstream_inference_cost0
provider_name"Amazon Bedrock"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
010
110
210
310
410
510
610
710
810
910